CN211892878U - Low-power direct current charger of electric automobile - Google Patents

Low-power direct current charger of electric automobile Download PDF

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Publication number
CN211892878U
CN211892878U CN201922459563.8U CN201922459563U CN211892878U CN 211892878 U CN211892878 U CN 211892878U CN 201922459563 U CN201922459563 U CN 201922459563U CN 211892878 U CN211892878 U CN 211892878U
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China
Prior art keywords
charging
current
direct current
alternating current
power
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CN201922459563.8U
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Chinese (zh)
Inventor
周强
汪进进
黄晓康
吴承亮
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Shenzhen Energy Efficiency Electrical Technology Co.,Ltd.
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Gospower Digital Technology Shenzhen Co ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/14—Plug-in electric vehicles

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  • Electric Propulsion And Braking For Vehicles (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The utility model discloses a low-power direct current charger of an electric automobile, which comprises an alternating current power plug or an alternating current power socket, a temperature sensor, an alternating current cable, a direct current charging circuit, a direct current cable and a direct current charging gun, wherein the direct current charging circuit comprises an alternating current-direct current conversion unit and a charging controller; the temperature sensor is arranged in an alternating current power plug or an alternating current power socket, the signal output end of the temperature sensor is connected with the charging controller, and the main loop of the alternating current-direct current conversion unit comprises an over-temperature protection switch controlled by the charging controller. When the temperature of the alternating current power plug or the alternating current power socket exceeds a protection threshold value, the over-temperature protection switch is switched off, and the charging or discharging of the direct current charger to the electric automobile is stopped. The utility model discloses when plug or socket are overheated, the disconnection of excess temperature protection switch stops the direct current charger to electric automobile's charging or discharge, can not bring the potential safety hazard of charge-discharge because alternating current cable plug or socket generate heat.

Description

Low-power direct current charger of electric automobile
[ technical field ]
The utility model relates to an electric automobile's direct current battery charging outfit especially relates to an electric automobile's miniwatt direct current charger.
[ background art ]
With the popularization of electric vehicles, the existing direct-current high-power charging and alternating-current low-power charging can not completely meet all charging requirements. The low-power direct current charger can replace a vehicle-mounted charger and an alternating current charging pile, and the cost of the vehicle is directly reduced. The low-power direct-current charger is similar to a charger on an alternating-current cable, but directly converts alternating current into direct current for charging an electric vehicle, and realizes real-time charging control. The low-power direct-current charger can also work in a reverse mode, and converts direct current of a battery of the electric automobile into alternating current to supply power to an alternating-current load or invert the alternating current to a power grid.
Application number is CN 201821197632.1's utility model discloses a formula intelligent charging ware is carried to new forms of energy electric automobile direct current, including charging case, plug and electric automobile rifle that charges, the charging case input passes through plug and domestic power intercommunication, and the output of charging case passes through electric automobile rifle that charges and electric automobile mouthful intercommunication that charges.
However, in an actual charging scenario, a plug or a socket of the ac cable may be oxidized or a socket or a plug plugged into the ac cable may be aged, so that during charging, the contact resistance at the plug or the socket on the ac cable is large, and the temperature is increased. It is also possible that the ac-powered cable is too thin resulting in a temperature increase. The over-high temperature of the AC side in the charging process may bring potential charging safety hazards.
[ contents of utility model ]
The to-be-solved technical problem of the utility model is to provide a can not bring the miniwatt direct current charger of electric automobile of potential safety hazard of charging because of alternating current cable plug or socket generate heat.
In order to solve the technical problem, the utility model adopts the technical scheme that the low-power direct current charger of the electric automobile comprises an alternating current power plug or an alternating current power socket, a temperature sensor, an alternating current cable, a direct current charging circuit, a direct current cable and a direct current charging gun, wherein the direct current charging circuit comprises an alternating current-direct current conversion unit and a charging controller; the temperature sensor is arranged in an alternating current power plug or an alternating current power socket, the signal output end of the temperature sensor is connected with the charging controller, and the main loop of the alternating current-direct current conversion unit comprises an over-temperature protection switch controlled by the charging controller.
In the low-power direct-current charger, the alternating-current/direct-current conversion unit comprises an AC/DC conversion circuit and a DC/DC conversion circuit, the AC/DC conversion circuit and/or the DC/DC conversion circuit comprises a plurality of switching tubes, and the control ends of the switching tubes are connected with the charging controller; and when the temperature of the alternating current power plug or the alternating current power socket exceeds a protection threshold value, the partial or all switching tubes are disconnected, and the charging or discharging of the direct current charger to the electric automobile is stopped.
According to the low-power direct current charger, the alternating current-direct current conversion unit comprises the AC/DC conversion circuit, the DC/DC conversion circuit and the charge and discharge switch, and the DC/DC conversion circuit is connected with the direct current charging gun through the charge and discharge switch; the control end of the charge and discharge switch is connected with the charge controller, and the charge and discharge switch is the over-temperature protection switch.
In the low-power direct-current charger, the temperature sensor is embedded in the alternating-current power plug or the alternating-current power socket and is integrally formed with the alternating-current power plug or the alternating-current power socket; the alternating current cable comprises a signal transmission line of a temperature sensor, and the temperature sensor is connected with a charging controller of the direct current charging circuit through the signal transmission line.
In the low-power direct current charger, the temperature sensor is a temperature switch.
The utility model discloses when plug or socket are overheated, the disconnection of excess temperature protection switch stops the direct current charger to electric automobile's charging or discharge, can not bring the potential safety hazard of charge-discharge because alternating current cable plug or socket generate heat.
[ description of the drawings ]
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic block diagram of a low-power dc charger of an electric vehicle according to embodiment 1 of the present invention.
Fig. 2 is an external view of a low-power dc charger of an electric vehicle according to embodiment 1 of the present invention.
Fig. 3 is a front view of a low-power dc charger of an electric vehicle according to embodiment 1 of the present invention.
Fig. 4 is an external view of a low-power dc charger of an electric vehicle according to embodiment 2 of the present invention.
[ detailed description of the invention ]
The structure of the low-power dc charger of the electric vehicle of embodiment 1 of the present invention is shown in fig. 1 to 4, and includes an ac power plug 10, a temperature sensor 12, an ac cable, a dc charging circuit 20, a dc cable and a dc charging gun 30, where the dc charging circuit 20 includes an ac/dc conversion unit 21 and a dc charging controller 22; the temperature sensor 12 is embedded in the ac power plug 10 and is integrally formed with the ac power plug 10. The ac power plug 10 and the dc charging circuit 20 are connected by a signal transmission line including a temperature sensor in the ac cable, and the signal output terminal of the temperature sensor 12 is connected to the dc charging controller 22 of the dc charging circuit through the signal transmission line.
The AC/DC conversion unit 21 includes an AC/DC conversion circuit, a DC/DC conversion circuit, and a charging/discharging switch, the AC/DC conversion circuit and/or the DC/DC conversion circuit includes a plurality of switching tubes, and the control ends of the switching tubes are connected to the DC charging controller 22; and when the temperature of the alternating current power plug exceeds a protection threshold value, the partial or all switching tubes are disconnected, the current for controlling direct current charging and discharging is zero, and the charging or discharging of the electric automobile by the direct current charger is stopped.
The DC/DC conversion circuit is connected with a DC charging gun 30 through a DC contactor switch 23 and a DC cable; the control end of the direct current contactor switch 23 is connected with the direct current charging controller 22, the direct current contactor switch 23 can also be used as an over-temperature protection switch, when the temperature of the alternating current power plug exceeds a protection threshold value, the direct current contactor switch is disconnected, the direct current charging and discharging current is controlled to be zero, and the charging or discharging of the direct current charger to the electric automobile is stopped.
The ac power plug 10 may be inserted into the ac outlet 100 on the user side to obtain ac input.
As shown in fig. 1, the pin 11 of the ac power plug 10 is connected to the ac terminal of the ac/dc converting unit 21 of the charger via an ac cable. The ac power obtained by the ac/dc conversion unit 21 is converted into dc power for charging the electric vehicle power battery 42. A dc side terminal of the ac/dc conversion unit 21 is connected to a dc contactor switch 23, and the other end of the dc contactor switch 23 is connected to the dc charging gun head 30 through a dc cable.
The utility model discloses above embodiment is integrated a temperature sensor 12 in the power plug 10 of alternating current cable to pass through the signal transmission line in the alternating current cable with temperature sensor 12's feedback signal, temperature sensor 12's signal output part passes through signal transmission line and direct current charging circuit's direct current transmission to direct current charging controller 22. The dc charge controller 22 detects in real time the feedback signal of the temperature sensor 12 in the power plug at the ac cable. The temperature sensor 12 generally uses a thermistor, and detects the resistance value of the thermistor. When the dc charging controller 22 detects that the temperature represented by the resistance value of the thermistor is higher than the threshold value of the protection temperature point, the dc charging controller 22 determines that the temperature of the power plug at the ac cable is overheated. The dc charging controller 22 controls the power switching tube of the ac-dc conversion circuit of the low-power dc charger to turn off, so that the charging current is zero, or controls the dc contactor on the dc port side of the low-power dc charger to turn off, so that the charging current is zero. And the dc charging controller 22 may transmit the termination of the charging operation to the BMS at the vehicle side through the charging gun head CAN bus. By performing the above operation, the ac-side current can be reduced to approximately 0A (and also a small standby power consumption current), thereby achieving protection against temperature overheating at the power plug 10 at the ac cable.
The control signal line of the dc charging controller 22 and the dc terminal of the dc contactor switch 23 are coupled to the dc charging socket 41 of the vehicle end via the signal line and the power line of the dc cable line and the dc charging gun head 30. The control signal lines of the dc charging sockets 41 are connected to the BMS vehicle controller 43 on the vehicle side. Therefore, the dc charging controller 22 can handshake and communicate with the vehicle-side BMS vehicle controller 43, and can control and monitor the charging process.
As shown in fig. 3, the basic circuit of the AC/DC conversion unit of the present embodiment includes two partial AC/DC conversion circuits 24 and a DC/DC conversion circuit 25. The AC port of the AC/DC converter circuit 24 is connected to the L line, N line, and PE line of the AC power plug 10. The DC side of the AC/DC converter circuit 24 is connected to the primary side of the DC/DC converter circuit 25. The secondary side of the DC/DC converter circuit 25 is rectified and output, and then connected to the DC contactor 23. The primary and secondary sides of the DC/DC converter circuit 25 are isolated by a high frequency transformer, the primary side of which is connected to a power switch 26.
During the charging process, when the dc charging controller 22 detects that the temperature reflected by the resistance value of the thermistor 12 exceeds the protection temperature threshold, the dc charging controller 22 performs an over-temperature protection operation. The dc charging controller 22 makes the charging current zero by controlling the power switch 26 to be turned off or the dc contactor 23 to be turned off, and sends a stop charging instruction to the vehicle-side BMS vehicle controller 43. When the current on the dc side is zero, the current on the ac power plug 10 is also approximately zero (the standby current of the low-power dc charger is in mA level), thereby implementing the over-temperature protection function on the ac terminal.
As shown in fig. 4, the low-power dc charger of the electric vehicle according to embodiment 2 of the present invention can operate in the reverse mode. The ac side of the dc charging circuit 20 is connected to the ac discharging outlet 50 via an ac cable. The temperature sensor 12 is integrated in the ac discharge socket 50, and in the present embodiment, a thermistor is used as the temperature sensor 12. Both ends of the thermistor are connected to the dc charge controller 22 through signal lines in the ac cable. The other portions of this embodiment are the same as those of the embodiment. The power battery 42 of the electric vehicle is converted into an alternating current by the direct current charging circuit 20 when operating in reverse, and is discharged after being connected to an alternating current load through the alternating current discharging socket 50.
During the discharging process, when the dc charging controller 22 detects that the temperature reflected by the resistance value of the thermistor exceeds the protection temperature threshold, the dc charging controller 22 performs an over-temperature protection operation. The dc charge controller 22 makes the charging current zero by controlling the power switch 26 to be turned off or the dc contactor 23 to be turned off, and sends a stop discharge instruction to the vehicle-side BMS vehicle controller 43. When the current on the direct current side is zero, the current on the alternating current power plug 10 is also zero, so that the over-temperature protection function of the alternating current end is realized.
The utility model provides a temperature sensor 12 also can use temperature switch, and temperature switch's break-make signal passes through the signal line in the alternating current cable and gives direct current charge controller 22 execution overtemperature protection action, and temperature switch can utilize the temperature sensing of bimetallic strip, makes the sheetmetal warp during the temperature change, drives the contact and cuts off or switch on the sensor circuit. When the temperature reaches the protection threshold, the contacts of the temperature switch are opened, and when the direct current charging controller 22 detects that the temperature switch is opened, it is recognized that the alternating current power plug or the alternating current power socket needs the over-temperature protection. When the temperature of the temperature switch falls below the recovery threshold, the contacts of the temperature switch are closed, and when the direct current charging controller 22 detects that the contacts of the temperature switch are closed, it is recognized that the temperature of the alternating current power plug or the alternating current power socket is normal. The on-off signal of the temperature switch can also directly control the power switch 26 to be turned off and driven to execute the temperature protection action.
The utility model discloses above embodiment need not increase the interchange circuit breaker of integration in alternating current cable alone, has reduced the volume and the cost of alternating current cable, has also reduced the failure fault that probably brings. The utility model discloses an alternating current-direct current power conversion unit can be directly under not increasing the part condition that opens circuit in addition, realizes the disconnection to direct current side power return circuit. Because the power switch and the physical switch are necessary in the alternating current-direct current power conversion unit, the on and off of the power loop can be realized. Only the feedback signal of the temperature detection device at the AC plug is transmitted to the DC charging controller through the AC cable, and the power switch and the physical switch in the AC/DC power conversion unit are turned off after the temperature is detected to reach the protection threshold value, so that the over-temperature protection of the AC side is realized.

Claims (5)

1. The utility model provides an electric automobile's miniwatt direct current charger, includes alternating current power plug or alternating current power socket, the alternating current cable, direct current charging circuit, direct current cable and direct current rifle that charges, direct current charging circuit includes alternating current-direct current conversion unit and charge controller, its characterized in that, including temperature sensor, temperature sensor installs in alternating current power plug or alternating current power socket, and temperature sensor's signal output part is connected with charge controller, includes the excess temperature protection switch by charge controller control in alternating current-direct current conversion unit's the major loop.
2. The low-power direct-current charger according to claim 1, wherein the alternating-current/direct-current conversion unit comprises an AC/DC conversion circuit and a DC/DC conversion circuit, the AC/DC conversion circuit and/or the DC/DC conversion circuit comprises a plurality of switching tubes, and control ends of the switching tubes are connected with the charging controller; and part or all of the switching tubes of the AC/DC conversion circuit and/or the DC/DC conversion circuit are used as the over-temperature protection switch.
3. The low-power direct-current charger according to claim 1, wherein the alternating-current-to-direct-current conversion unit comprises an AC/DC conversion circuit, a DC/DC conversion circuit and a charge and discharge switch, and the DC/DC conversion circuit is connected with the direct-current charging gun through the charge and discharge switch; the control end of the charge and discharge switch is connected with the charge controller, and the charge and discharge switch is used for over-temperature protection.
4. The low power dc charger according to claim 1, wherein the temperature sensor is embedded in the ac power plug or the ac power socket, and is integrally formed with the ac power plug or the ac power socket; the alternating current cable comprises a signal transmission line of a temperature sensor, and the temperature sensor is connected with a charging controller of the direct current charging circuit through the signal transmission line.
5. The low power dc charger according to claim 1, wherein said temperature sensor is a temperature switch.
CN201922459563.8U 2019-12-31 2019-12-31 Low-power direct current charger of electric automobile Active CN211892878U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201922459563.8U CN211892878U (en) 2019-12-31 2019-12-31 Low-power direct current charger of electric automobile

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201922459563.8U CN211892878U (en) 2019-12-31 2019-12-31 Low-power direct current charger of electric automobile

Publications (1)

Publication Number Publication Date
CN211892878U true CN211892878U (en) 2020-11-10

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201922459563.8U Active CN211892878U (en) 2019-12-31 2019-12-31 Low-power direct current charger of electric automobile

Country Status (1)

Country Link
CN (1) CN211892878U (en)

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GR01 Patent grant
GR01 Patent grant
TR01 Transfer of patent right

Effective date of registration: 20210915

Address after: 518000 101, block B, building a, Jingfa zhizaoyuan, Xiawei community, Xixiang street, Bao'an District, Shenzhen, Guangdong Province

Patentee after: Shenzhen Energy Efficiency Electrical Technology Co.,Ltd.

Address before: 518000 south of Baotian 1st Road, Xixiang street, Bao'an District, Shenzhen City, Guangdong Province

Patentee before: GOSPOWER DIGITAL TECHNOLOGY (SHENZHEN) Co.,Ltd.

TR01 Transfer of patent right